Method for determining phosphate

US11714050B2 · kind B2 · utility

Assignee

• HACH LANGE GMBH · DE

Inventors

• Andreas Golitz · Moers, DE
• Andreas Jonak · Meerbusch, DE
• Michael Kussmann · Goldkronach, DE
• Axel Leyer · Rheydt, DE
• Andreas Schwenk · Bruggen, DE
• Markus Hahn · Kempen, DE

Key dates

• Filing date: Aug 9, 2018
• Grant date: Aug 1, 2023
• Expiry date: Jul 7, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N31/22
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for determining a phosphate concentration in a water sample includes providing the water sample, adding a first acid to the water sample to obtain a second water sample in which a concentration of the first acid is at least 0.5 wt.-%, performing a first photometric measurement of the second water sample, adding a coloring component to the second water sample to obtain a third water sample, performing a second photometric measurement of the third water sample, and calculating the phosphate concentration from a difference between the first photometric measurement and the second photometric measurement.